globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-11-2655-2017
Scopus记录号: 2-s2.0-85034954236
论文题名:
GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica
作者: Shean D; E; , Christianson K; , Larson K; M; , Ligtenberg S; R; M; , Joughin I; R; , Smith B; E; , Max Stevens C; , Bushuk M; , Holland D; M
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期:6
起始页码: 2655
结束页码: 2674
语种: 英语
英文关键词: air temperature ; basal melting ; digital elevation model ; estimation method ; GPS ; ice retreat ; ice shelf ; ice-ocean interaction ; snow accumulation ; Antarctica ; Pine Island Bay ; Pine Island Glacier ; West Antarctica
英文摘要: In the last 2 decades, Pine Island Glacier (PIG) experienced marked speedup, thinning, and grounding-line retreat, likely due to marine ice-sheet instability and ice-shelf basal melt. To better understand these processes, we combined 2008-2010 and 2012-2014 GPS records with dynamic firn model output to constrain local surface and basal mass balance for PIG. We used GPS interferometric reflectometry to precisely measure absolute surface elevation (Zsurf) and Lagrangian surface elevation change (DZsurf/Dt). Observed surface elevation relative to a firn layer tracer for the initial surface (Zsurf-Zsurf()') is consistent with model estimates of surface mass balance (SMB, primarily snow accumulation). A relatively abrupt ĝ1/4 ĝ0.2-0.3ĝm surface elevation decrease, likely due to surface melt and increased compaction rates, is observed during a period of warm atmospheric temperatures from December 2012 to January 2013. Observed DZsurf/Dt trends (-1 to -4 m yr-1) for the PIG shelf sites are all highly linear. Corresponding basal melt rate estimates range from ∼ 10 to 40m yr-1, in good agreement with those derived from ice-bottom acoustic ranging, phase-sensitive ice-penetrating radar, and high-resolution stereo digital elevation model (DEM) records. The GPS and DEM records document higher melt rates within and near features associated with longitudinal extension (i.e., transverse surface depressions, rifts). Basal melt rates for the 2012-2014 period show limited temporal variability despite large changes in ocean temperature recorded by moorings in Pine Island Bay. Our results demonstrate the value of long-term GPS records for ice-shelf mass balance studies, with implications for the sensitivity of ice-ocean interaction at PIG. © Author(s) 2017.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75473
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Applied Physics Laboratory Polar Science Center, University of Washington, Seattle, WA, United States; Department of Civil and Environmental Engineering, University of Washington, Seattle, WA, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, United States; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, NJ, United States; Courant Institute of Mathematical Sciences, New York University, New York, NY, United States; Center for Global Sea-Level Change, New York University, Abu Dhabi, United Arab Emirates

Recommended Citation:
Shean D,E,, Christianson K,et al. GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica[J]. Cryosphere,2017-01-01,11(6)
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